How come I can't compile this file in this folder,but can in others

Question

import java.util.*;
public class AlphabeticComparator
implements Comparator{
public int compare(Object o1, Object o2) {
String s1 = (String)o1;
String s2 = (String)o2;
return s1.toLowerCase().compareTo(
s2.toLowerCase());
this code can be compiled in any folders except
e:\java\
why??? the error is:
--------------------Configuration: j2sdk1.4.0 <Default>--------------------
E:\java\AlphabeticComparator.java:3: AlphabeticComparator should be declared abstract; it does not define compare(java.lang.Object,java.lang.Object) in AlphabeticComparator
public class AlphabeticComparator
^
E:\java\AlphabeticComparator.java:6: inconvertible types
found : Object
required: java.lang.String
String s1 = (String)o1;
^
E:\java\AlphabeticComparator.java:7: inconvertible types
found : Object
required: java.lang.String
String s2 = (String)o2;
^
3 errors
Process completed.

Answer 1

It looks like you have a class called "Object" in that same directory that the compiler is using when you use "Object", and then the compiler complains because it wasn't "java.lang.Object". Get rid of it -- you should have called it something else, anyway.